package com.xy.framework.Observable;

import java.util.Observable;

public interface Observer {
	/**
	 * This method is called whenever the observed object is changed. An
	 * application calls an <tt>Observable</tt> object's
	 * <code>notifyObservers</code> method to have all the object's observers
	 * notified of the change.
	 * 
	 * @param o
	 *            the observable object.
	 * @param arg
	 *            an argument passed to the <code>notifyObservers</code> method.
	 */
	void update(Observable o, Object arg);
}
